Submission #999002

#	Time	Username	Problem	Language	Result	Execution time	Memory
999002		huutuan	Teleporters (IOI08_teleporters)	C++14	5 / 100	125 ms	22608 KiB

teleporters

#include<bits/stdc++.h>

using namespace std;

const int N=2e6+10;
int n, m;
int jump[N];

int32_t main(){
   ios_base::sync_with_stdio(false);
   cin.tie(nullptr);
   cin >> n >> m;
   memset(jump, -1, sizeof jump);
   for (int i=1; i<=n; ++i){
      int u, v; cin >> u >> v;
      jump[u]=v; jump[v]=u;
   }
   int cnt=0, pos=0;
   while (1){
      while (pos!=N && jump[pos]==-1) ++pos;
      if (pos==N) break;
      pos=jump[pos]+1;
      ++cnt;
   }
   cnt+=4*(m/2)+(m&1)*(1+2*(n&1));
   cout << cnt << '\n';
   return 0;
}

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